I have two pairs of S5000 speakers. One was a pre-production prototype with the speaker cans mounted on Walsh 400 bases, the pedigree confirmed by John S himself.
The other pair I modified with the factory kit using new S5000 cans, replacement input board and some other stuff, using my Walsh 5 SEs that I have owned since new.
The modificaion on the 5 SEs are noticibly better than the original versions, which were still functioning great. I was quite pleased with the results. Highly recommend doing the S5000 upgrade vs a refurb.